Hi Craig,
I stayed on that park back in 2006 ! I don't know about radio activity but there is a fabulous location for radio at Flamborough head with stunning views over the north sea .When I went there there was a cafe that appeared to be closed down but I don't think it would have been an issue to erect a fishing pole antenna etc and operate from the car park

his there are a good few camp channels in that area and am not sure which is wich but i am sure blue dolphin is on 163.925 hire channel and you might want to check the wtr for the ones on the others they are very active one some channels, 165.200 and 167.200 at thornwick bay too, flamborough taxis 165.3125 + plus split 4.8+, scarborough cctv has down graded to motofloppo so no go there, and may be check out the 446 channels, in Brid ch 4 and cb channels for local gossip, hope that helps